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Andreas Farre authored
We can remove isOnlyToplevelInTabGroup entirely since we have BrowsingContext/BrowsingContextGroup exposed through chrome-webidl. Checking if a browsing context is the only top level (auxilliary or otherwise) is only a matter of checking that there isn't a parent, and that the size of the browsing context group is 1. Differential Revision: https://phabricator.services.mozilla.com/D46590 --HG-- extra : moz-landing-system : lando
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